A team of retired detectives investigate the mysterious 2017 drowning death of a graduate student in Pittsburgh and explore whether the case is connected to the Smiley Face Killer theory they've been investigating for the past decade.
A team of retired detectives travels to La Crosse, Wisconsin, to investigate the 2006 death of a college basketball player; they believe La Crosse is ground zero for their Smiley Face Killer theory with multiple drowning deaths of college-aged men.
A team of retired detectives travels to Boston to investigate the 2009 death of a young Navy veteran; the victim's girlfriend spoke to him just minutes before he vanished and the team believes his death could be the work of the Smiley Face Killers.
